卷积编码及译码在数字通信系统中的仿真

Simulation of Convolutional Encode and Decode in Digital Communication System

本文介绍了利用点对点（哪）数字通信系统模型，推导卷积编码和Viterbi译码的非线性传输函数的方法以及对Viterbi译码软判决和硬判决的性能分析。通过Matlab中的Simulink仿真模块，对系统模型进行了建模，其仿真结果表明。增大卷积编码和Viterbi译码的约束长度可以提高误码性能。最后，得到了Viterbi译码在软判决和硬判决条件下的误码曲线。

This paper introduces the use of point-to-point digital communication to derive the non-linear transmission function of convolutional encode and Viterbi decode. The performance of soft decision and hard decision of Viterbi decoder is also analyzed. The system model is resulted from the Matlab Simulink. The simulation shows increasing convolutional encode and Viterbi decode constraint length may enhance the performance of coded error. Finally a curve showing the Viterbi decode error is depicted under the conditions of software decision and hard decision.